Plugin.php

<?php

namespace Drupal\Component\Annotation;

use Drupal\Component\Utility\NestedArray;

/**
 * Defines a Plugin annotation object.
 *
 * Annotations in plugin classes can use this class in order to pass various
 * metadata about the plugin through the parser to
 * DiscoveryInterface::getDefinitions() calls. This allows the metadata
 * of a class to be located with the class itself, rather than in module-based
 * info hooks.
 *
 * @ingroup plugin_api
 *
 * @Annotation
 */
class Plugin implements AnnotationInterface {
    
    /**
     * The plugin definition read from the class annotation.
     *
     * @var array
     */
    protected $definition;
    
    /**
     * Constructs a Plugin object.
     *
     * Builds up the plugin definition and invokes the get() method for any
     * classed annotations that were used.
     */
    public function __construct($values) {
        $reflection = new \ReflectionClass($this);
        // Only keep actual default values by ignoring NULL values.
        $defaults = array_filter($reflection->getDefaultProperties(), function ($value) {
            return $value !== NULL;
        });
        $parsed_values = $this->parse($values);
        $this->definition = NestedArray::mergeDeepArray([
            $defaults,
            $parsed_values,
        ], TRUE);
    }
    
    /**
     * Parses an annotation into its definition.
     *
     * @param array $values
     *   The annotation array.
     *
     * @return array
     *   The parsed annotation as a definition.
     */
    protected function parse(array $values) {
        $definitions = [];
        foreach ($values as $key => $value) {
            if ($value instanceof AnnotationInterface) {
                $definitions[$key] = $value->get();
            }
            elseif (is_array($value)) {
                $definitions[$key] = $this->parse($value);
            }
            else {
                $definitions[$key] = $value;
            }
        }
        return $definitions;
    }
    
    /**
     * {@inheritdoc}
     */
    public function get() {
        return $this->definition;
    }
    
    /**
     * {@inheritdoc}
     */
    public function getProvider() {
        return $this->definition['provider'] ?? FALSE;
    }
    
    /**
     * {@inheritdoc}
     */
    public function setProvider($provider) {
        $this->definition['provider'] = $provider;
    }
    
    /**
     * {@inheritdoc}
     */
    public function getId() {
        return $this->definition['id'];
    }
    
    /**
     * {@inheritdoc}
     */
    public function getClass() {
        return $this->definition['class'];
    }
    
    /**
     * {@inheritdoc}
     */
    public function setClass($class) {
        $this->definition['class'] = $class;
    }

}